Cooling device for piston-rods.



E hack as above set forth is avoided.i fi

ln the accompanying drawings one einboch-'l narran artritis lirnnr enrich.

RUDQLF HARTWIG, 0F ESSEN-UN-THF-RUHR, GERMANY, ASSIGUGR TU FRIED. KRUPP AKTIENGESELLSCHAFT, F ESSEN-0N-THE7RUHR GERMANY.

Specification of Letters Patenti.

Patented May 29, i906.

Application and May 17, 1905. serial No. 260.842.

To all whom I't may concern:

Be it known that l, RUDOLF ILxn'rwio, a subject of the German Emperor, and a resident of 34 IIohenzollernstrasse, Essen-onthe Ruhr, Germany,l have invented cert ain new and useful Improvements in Cooling Devices for Pistonellods, of which the following is a specilicatioi'i.

The present invention relates to cooling devices for piston-rods, and in particular to piston-rods of internatenInhustion engines.

lt is a connnon expedient in explosion-em gines to provide the piston-rods with a longitudinal here through which a coolii'ig niediuin is caused to ilovv. lnsuch devices, however, the temperature of the outer Wall of the piston-rod, Which is directly exposed to the action of the explosive gases, becomes considerably' higher than the temperature of the wall of the bore in the rod, and these differences intemperature create tensions in the piston-rod which are liable to cause the rod to loreak.

The object of the present invention is to provide a cooling device in which the ydrawnient of the invention is illustrated way of example.

Figure 1 is a top view, partly in section, of the improved cooling device and parts of an engine. Fig. 2 `is a longitudinal section, on an enlarged scale, of parts that are shown in plan in Fig. 1 5 and Fig. 3 is a side elevation of the left-hand end of Figfl? in a plane at right anfrles to the plane of Fig. 2.

rhc piston-rod B of the piston A passes through the two cylindenheads C of the Working cylinder C and has one of its ends connected to the cross-head D. Une of the wrists d of the eross-headD is provided with an axial perforation or inlet d, Fig. 2, which communicates with a longitudinal bore B in the piston-rod B through the medium of a transverse passage b3 in the piston-rod. The perforation d2v also communicates with a curved pipe E. The here B is closed toward the exterior by means of a screw-plug M, Fig. 2, terminates in the part of the pisvton-rod that is surrounded hy the piston, and communicates, with an' annular chamber a' in the piston A through a transverse outlet-pas sage b, Fig. 2. linto theehamher o opens a `second transverse passage or inlet t7, which coinnninicates with a here B2 coaxial With the perforation B', but located in that part of the piston-rod extending from the opposite side of the piston and opening into an outlet pipeQ, Figs. 2 and 3, that curves dow: wardly from the free end of the piston-rod. To the curved pipe E is secured a pipe F, Fig. 1, that extends parallel to the piston-rod and projects into a reservoir G, which coinniunicates With a conduit H, that niaylead to a force-pump (not shown in the drawings) or other suitable source ol' cooling medium under pressure. The pipe F is of sullicient length to continuously renlainin connection with the reservoir Gr during the workingof the engine.

On each side of the. piston A and around the piston-rod B are arranged tubular nian tles J and J', having their ends provided with inwardly-extending Ranges i? i and 'it respectively, ig. 2, of which the ila-nges if and fi near the piston A are screw-threaded and engage screw-threads on the pistoxnrod, while the outer anges i and i5 have cylindrical inner faces tightly fitting the outer faces of the piston-rod- This arrangement permits of the free expansion of the inantles IJ J when they become heated by the explosion. The Inantles J and J pass tightly through stufling-boxes cL in the cylindercovers and are of suliicient length to remain in engagement with the stulllw--hoxes in the end positions of the piston Within the cylinder. The ahove-descrihed arrangement and form of the lnantles J il leave a hollow space ,K and K, Fig. 2, between each mantle and the piston-rod B, through which space the cool ing medium is caused to pass. To that end communication is provided between the holn low space and the perforation B through the medium. of passages b4 and b5, located in proxilnity to the ends of the mantle J and the outlet and the inlet of the perforation B', and likewise between the hollow space li and the perforation BL through the niediuin of passages t" and b9 near the inlet and the outlet erforation B2. n order to cause the Greater part ol' the cooling medium to ass tarough the hollow spaces K and K, p ugs N and B, which are provided with a narrow ierforation n. and p', are arranged in the peritorations B and B2 in the proximity of the passages fr* and 5R.

The medium for cooling the piston-rod,`

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which may be water or other suitable fluid, passes from the conduit H into the reservoir G and through the pipe F, the curved pipe E, and the passages d2 and b3 to the part of the perforation B in the piston-rod that is in front of the plug N. From the said part of the perforation B the greater part of the cooling medium flows through the passages b4 to the hollow space K and from there tlnough the passages b5 into the part of the perforation B that is between the plug N and the passage be, while a minor part of the cooling medium flows through the perforation a in the plug'N and prevents stagnation of the cooling medium in the part of the perforation that is between the'plug N and the passages b. From the perfor-ations B the cooling medium flows through the passage b into the aniiular space o in the piston and from there through the passage 67 into the part of the perforation B2 that is in front of the plug l". From the said part of the perforation B2 the greater part of the cooling medium flows through the passage bs into the hollow space K ,and from there through the channels b into the part of the perforation B2 that is behind the plug P, while the minor part of the cooling medium fiows through the perforation p in the plu(T l. Finally, the combined cooling medium ows through the pipe Q into a reservoir arranged beneath the path of travel of the pipe1 (N ot shown in the drawings.)

Having thus described the invention, the

following is what is claimed as new therein:

1. The combination with a longitudinallybored piston-rod, of a mantle surrounding the same and spaced 'therefrom7 an inlet for the cooling medium at one end of the rod, and an outlet at the other end of the rod, the rod being provided with a passage connecting the bore in the rod with the mantle near the cooling-medium inlet, to provide -a flow in the same direction through the rod and the mantle. l

2. The combination with a longitudinallybored piston-rod, of a mantle surrounding the same and spaced therefrom, an inlet for the cooling medium at one end of the rod, an outlet at the other end of the rodg'f' the rod being provided with a passage connecting the bore in the rod with the mantle 'near the cooling-medium inlet and a passage connecting the mantle-s ace with the rod-bore near the outlet of sai medium, to provide a flow in the same direction through the rod and the mantle..

3. The combination with a longitudinallybored piston-rod, of a mantle surrounding the same and spaced therefrom an inlet for t'he cooling-medium at one end of the rod, an outlet at the other end of the rod, the rod being provided with a passage connecting the bore-in the rod with the mantle near the cooling medium inlet, and a passage connecting the mantle-space with the rod-bore near the outlet of said medium, to provide a flowin the same direction through the-rod and the mantle, and means between the two passages for retarding the flow through the rod.

4. The combination with a longitudinallybored piston-rod, of a mantle surrounding the same and spaced therefrom, an inlet for the cooling medium at one end of the rod and an outlet for the cooling medium at the other end ef the rod, the rod being provided with a transverse passage connecting the bore and the mantle-space near the inlet and inclined in one direction,- and with an oppositely-inclined transverse passage connecting the mantle-space and the bore near the outlet.

5. The combination with a hollow piston, of a piston-rod extending fromopposite sides of the piston and provided with two longitudinal bores, a mantle surrounding each projeeting por `on of the rod, and spaced therefrom, communi"ation between each bore and thc hollow piston, a cooling-medinni-supply pipe connected to one end of the piston-rod and its bore, and an outlet-pipe connected to the other end of the piston-rod and its bore, the piston-rod being provided with transverse passages connecting the bores with the mantle-spaces near each end of each mantle.

6. The combination of a longitudinallyperforated piston-rod, a perforated plug fitted in the perforation, a mantle surrounding the rod and spaced therefrom, and transverse perforations in the rod leading to the space between the mantle and the rod.

7. The combination with a piston-rod, of a mantle spaced from the rod to provide a cooling-chamber, said mantle being secured at one end to the rod and having its other end free to expand and contract and provided with a flange tightly fitting the piston-rod.

8. A cooling device for lo1lgitudinally-perforatcd piston-rods comprising a Inantle surrounding the rod and spaced therefrom, rmeans providing `communieation between-the longitudinal perforation of the piston-rod and the space between the mantle and the rod, means for supplying a cooling medium to the 'rod and means for permitting a part of the. cooling Inedium to pass through the rod without going tlnough said intermediate space.

9. A cooling device for piston-rods comprising a mantle surrounding the rod and spaced therefrom, means securing said mantle to said. rod by oneend only and thus permitting the mantle to expand freely, and means for passing a cooling medium through the space between the mantle and the pistonrod. The foregoing specification signed at Dsseldorf this 3d day of May, 1905.

RUDOLF HAR'IWIG.

ln presence 0f--.

PETER LIEBER,

WILLIAM EssENwEIN.

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